Trojan Boat Forum

Has anyone tried water sandblasting the bottom of a boat. It was recommended to me as not as abrasive (softer) on gel coat etc. I purchased one but have not used it as yet.

Any experiences?

I would never sand blast the bottom , soda blasting is the way to go.

larryeddington wrote:Has anyone tried water sandblasting the bottom of a boat. It was recommended to me as not as abrasive (softer) on gel coat etc. I purchased one but have not used it as yet.

Any experiences?

the yard / marina I'm in has switched over from air/soda and or sand to water. They've used on a couple of OA's and the boats came out great with very little after sanding needed before epoxy went on....but like any blasting it's in the touch and skill of the person doing the job. IMO

Hello.

I may not be the best expert to advise, but I just finished the bottom of my boat. I would've like to sand blast it because it would've given me a clearer picture of the condition but could not at this time.

For the little pourous holes, I sanded them down using a heavy 50 grit paper. Sounds harsh but there was so much paint that it took alot just to get to the gel coat. I took all the little holes down, which at the end the boat looks like it has chicken pox. I'm lucky to be in Florida and the weather has been warm, so if there was any moisture in two to three days it was gone. I didn't find much though.

I then came behind with little bits of strongly mixed resin and painted in all the spots. Gave that a day to dry nice and sanded them smooth and came behind it with a high grade underwater filler. Filled or covered all the spots and sanded smooth as could be. Then painted all with gelcoat to seal. I put two coats of primer paint and then two coats of bottom paint.

I don't feel it was the best job, but I'm sure the boat is sealed and all the micro pores are filled and won't turn into blisters for atleast a few years. But the plan given to you sounds right.

I'll be honest, If I had $7000 and found someone willing to do this Nasty, Nasty Job, I would do it and be greatful. You are very fortunate. The only thing is deciding if your boat is worth it as for value and resale. We all loose, and I commend you for bitting the bullet, because the boat I bought no one took such care and it definitely is worth it in the end for the life of your boat and sanity. Again It is a nasty job and you should be greatful someone else will do it, because it will definitely take years off of you to do it yourself. It took me about two weeks of filth and poison.

Also while doing this you should redo all the seacocks, running gear, trim tabs and wood under the running gear in the boat. This will make future life much better.

Good luck and all the best.

Robert

Blasting can remove some gel coat and then you forcing water in to those areas ( that were dry )? I would think twice . But time will tell . Of course some pro's say it can take a year to dry a hull right so it may not be a big deal , But that could be why many blister repairs come back in a few years too .

I post this on a thread here but I think it goes well here

http://www.zahnisers.com/blisters_hydrolysis.htm

http://www.trojanboats.net/wforum/viewt ... 8&start=15

One good thing it has been high a dry for 3 years now. By the looks of it it has been sanded and may just need a touchup sanding and barrier coat. I will try and get a picture of it. One can see where the PO swiped smoothing material over rough spots. Reminds me of the use of glazing putty use on auto bodies prior to final sanding.